Name of Stratigraphic unit and correlation with Stage Slices:

Didymograptus nitidus
Tremadocian
Tremadocian
1


Name refers to the following Stratigraphic units:



Opinion Reference

Bergström, S.M
2009
The new chronostratigraphic classification of the Ordovician System and its relations to major regional series and stages and to δ13C chemostratigraphy


Opinion is based on (if other than Time Slice):